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Joong-Seok Kim, Si-Hoon Lee, Yoon-Sang Oh, Jeong-Wook Park, Jae-Young An, Hyun-Seok Choi, Kwang-Soo Lee
BACKGROUND: Pulse wave velocity is a marker of arterial stiffness and a surrogate marker of vascular damage. Autonomic abnormalities associated with blood pressure are relatively commonly observed in patients with Parkinson's disease (PD). OBJECTIVE: The purpose of this study was to compare arterial stiffness between patients with PD and controls and investigate the associations between cardiovascular autonomic dysfunction and pulse wave velocity in PD. METHODS: One hundred twenty-five PD patients without diabetes mellitus were enrolled into this study, along with 22 age-matched controls...
October 27, 2016: Neuro-degenerative Diseases
Helen L MacLaughlin, Iain C Macdougall, Wendy L Hall, Tracy Dew, Konstantinos Mantzoukis, Jude A Oben
BACKGROUND: The outcomes of intragastric balloon (IGB) placement to achieve weight loss in obese patients with chronic kidney disease (CKD) have not been reported to date. This study aimed to assess the safety and efficacy of the IGB as a weight-loss treatment among this patient population. METHODS: A prospective, single-arm, 'first in CKD' interventional study was conducted in patients with a body mass index >35 kg/m2 and CKD stages 3-4, referred for weight loss...
October 27, 2016: American Journal of Nephrology
C R Campos Herrera, G C Beltramini, W M Avelar, F O Lima, L M Li
Differently from previous studies that used Transcranial Doppler (TCD) and functional MRI (fMRI) for cerebral vasomotor reactivity (CVR) assessment in patients with carotid stenosis (CS), we assessed CVR using an identical stimulus, the Breath-Holding Test (BHT). We included 15 patients with CS and 7 age-matched controls to verify whether fMRI responded differently to BHT between groups and to calculate the agreement rate between tests. For TCD, impaired CVR was defined when the mean percentage increase on middle cerebral artery velocities was ≤31% on 3 consecutive 30-s apnea intercalated by 4-min normal breathing intervals...
October 24, 2016: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
Xiaojin Qian, Liang Liang, Qiu Shen, Qin Sun, Lianpeng Zhang, Zhixiao Liu, Shuhe Zhao, Zhihao Qin
Drought is a type of natural disaster that has the most significant impacts on agriculture. Regional drought monitoring based on remote sensing has become popular due to the development of remote sensing technology. In this study, vegetation condition index (VCI) data recorded from 1982 to 2010 in agricultural areas of China were obtained from advanced very high resolution radiometer (AVHRR) data, and the temporal and spatial variations in each drought were analyzed. The relationships between drought and climate factors were also analyzed...
November 2016: Environmental Monitoring and Assessment
Yu P Semochkina, E Yu Moskaleva
Stem cell cultures are heterogeneous and include true stem cells and progenitor cells. True stem cells are identified by flow cytofluorometry as a cell subset characterized by low accumulation of fluorescent dye rhodamin-123 and forming a side population. Low-dose γ-irradiation (10-200 mGy) of human skin epithelial stem cells and epithelial H69 tumor cells to was followed by an increase in cell counts by day 7 after the exposure. In parallel, reduction of the side population to 4-30% from the control for epithelial stem cells on the next day after exposure and to 22-36% from the control for H69 cells in 3 days after exposure...
October 26, 2016: Bulletin of Experimental Biology and Medicine
GuiYun Hang, WenLi Yu, Tao Wang, Zhen Li
In order to determine the adsorption mechanism of water on the crystal surfaces of the explosive JOB-9003 and the effect of this adsorption on the sensitivity and detonation performance of this explosive, a model of the crystal of JOB-9003 was created in the software package Materials Studio (MS). The adsorption process was simulated, and molecular dynamics simulation was performed with the COMPASS force field in the NPT ensemble to calculate the sensitivity and detonation performance of the explosive. The results show that the maximum trigger bond length decreases whereas the interaction energy of the trigger bond and the cohesive energy density increase after adsorption, indicating that the sensitivity of JOB-9003 decreases...
November 2016: Journal of Molecular Modeling
Wang Heping, Geng Xingguo, Li Xiaoguang, Zang Duyang
This paper presents an exploration of the separation behavior and pattern formation in a shear binary fluid with dynamic temperature after slow cooling via coupled lattice Boltzmann method. The phase separation procedure can be divided into three different stages: spinodal decomposition, domain growth, and domain stretch. The effect of thermal diffusion was observed to be more significant than that of shear convection in the spinodal decomposition stage, while the opposite was observed in the domain growth stage...
October 2016: European Physical Journal. E, Soft Matter
Kai Lin, Leng Meng, Jeremy D Collins, Varun Chowdhary, Michael Markl, James C Carr
The aim of the present study was to test the hypothesis that heart deformation analysis (HDA) is able to discriminate regional myocardial motion patterns on the left ventricle (LV). Totally 21 healthy volunteers (15 men and 6 women) without documented cardiovascular diseases were recruited. Cine MRI was performed on those subjects at four-chamber, two-chamber, and short-axis views. The variations of segmental myocardial motion indices of the LV, which were measured with the HDA tool, were investigated. Regional displacement, velocity, strain and strain rate were compared between lateral wall and septal wall using t tests...
October 25, 2016: International Journal of Cardiovascular Imaging
Mingshun Jiang, Yaozhang Sai, Xiangyi Geng, Qingmei Sui, Xiaohui Liu, Lei Jia
We proposed and studied an impact detection system based on a fiber Bragg grating (FBG) sensor array and multiple signal classification (MUSIC) algorithm to determine the location and the number of low velocity impacts on a carbon fiber-reinforced polymer (CFRP) plate. A FBG linear array, consisting of seven FBG sensors, was used for detecting the ultrasonic signals from impacts. The edge-filter method was employed for signal demodulation. Shannon wavelet transform was used to extract narrow band signals from the impacts...
October 24, 2016: Sensors
Mingren Shen, Fangfu Ye, Rui Liu, Ke Chen, Mingcheng Yang, Marisol Ripoll
Chemical gradients maintained along surfaces can drive fluid flows by diffusio-osmosis, which become significant at micro- and nano-scales. Here, by means of mesoscopic simulations, we show that a concentration drop across microchannels with periodically inhomogeneous boundary walls can laterally transport fluids over arbitrarily long distances along the microchannel. The driving field is the secondary local chemical gradient parallel to the channel induced by the periodic inhomogeneity of the channel wall...
September 28, 2016: Journal of Chemical Physics
Allan Garcia, Xavier Buelna, Evgeny Popov, Jussi Eloranta
Intense shock waves in superfluid (4)He between 1.7 and 2.1 K are generated by rapidly expanding confined plasma from laser ablation of a metal target immersed in the liquid. The resulting shock fronts in the liquid with initial velocities up to ca. Mach 10 are visualized by time-resolved shadowgraph photography. These high intensity shocks decay within 500 ns into less energetic shock waves traveling at Mach 2, which have their lifetime in the microsecond time scale. Based on the analysis using the classical Rankine-Hugoniot theory, the shock fronts created remain in the solid phase up to 1 μs and the associated thermodynamic state appears outside the previously studied region...
September 28, 2016: Journal of Chemical Physics
D L Bones, J C Gómez Martín, C J Empson, J D Carrillo Sánchez, A D James, T P Conroy, J M C Plane
On entering the Earth's atmosphere, micrometeoroids partially or completely ablate, leaving behind layers of metallic atoms and ions. The relative concentration of the various metal layers is not well explained by current models of ablation. Furthermore, estimates of the total flux of cosmic dust and meteoroids entering the Earth's atmosphere vary over two orders of magnitude. To better constrain these estimates and to better model the metal layers in the mesosphere, an experimental Meteoric Ablation Simulator (MASI) has been developed...
September 2016: Review of Scientific Instruments
Liangping Wang, Xinjun Zhang, Tieping Sun, Wentin Mao
A kind of fast shutter for protecting the diagnosis devices in Z pinch experiments is introduced in this paper. The shutter is composed of a pulling rod, a magnetic core, and a solenoid. Different from the traditional coils which were used at the voltage of 220 V, the solenoid we used must endure the high voltage of 5-10 kV and the deformation which maybe caused by the 5-10 T intense magnetic field. A creative configuration for the solenoid is developed including the winding guide, insulating sleeve, and stainless-steel sleeve...
September 2016: Review of Scientific Instruments
M Y Pustylnik, M A Fink, V Nosenko, T Antonova, T Hagl, H M Thomas, A V Zobnin, A M Lipaev, A D Usachev, V I Molotkov, O F Petrov, V E Fortov, C Rau, C Deysenroth, S Albrecht, M Kretschmer, M H Thoma, G E Morfill, R Seurig, A Stettner, V A Alyamovskaya, A Orr, E Kufner, E G Lavrenko, G I Padalka, E O Serova, A M Samokutyayev, S Christoforetti
New complex-plasma facility, Plasmakristall-4 (PK-4), has been recently commissioned on board the International Space Station. In complex plasmas, the subsystem of μm-sized microparticles immersed in low-pressure weakly ionized gas-discharge plasmas becomes strongly coupled due to the high (10(3)-10(4) e) electric charge on the microparticle surface. The microparticle subsystem of complex plasmas is available for the observation at the kinetic level, which makes complex plasmas appropriate for particle-resolved modeling of classical condensed matter phenomena...
September 2016: Review of Scientific Instruments
Zhengyong Duan, Chuansheng Tang, Yang Li, Junliang Han, Guoxiong Wu
Pulse shaping techniques are discussed in this paper for the practicability of a developed high-g shock tester. The tester is based on collision principle where there is a one-level velocity amplifier. A theoretical and experimental study of pulse shaping techniques is presented. A model was built and theoretical formulae were deduced for the shock peak acceleration and its duration. Then theoretical analysis and some experiments were conducted. The test results verify the validity of theoretical model and show that the shock tester can generate the expected high-g shock pulses by integrated usage of different impact velocities and pulse shapers made from different materials...
September 2016: Review of Scientific Instruments
Yinghui Quan, YaChao Li, Yaojun Wu, Lei Ran, Mengdao Xing, Mengqi Liu
Frequency agility radar, with randomly varied carrier frequency from pulse to pulse, exhibits superior performance compared to the conventional fixed carrier frequency pulse-Doppler radar against the electromagnetic interference. A novel moving target detection (MTD) method is proposed for the estimation of the target's velocity of frequency agility radar based on pulses within a coherent processing interval by using sparse reconstruction. Hardware implementation of orthogonal matching pursuit algorithm is executed on Xilinx Virtex-7 Field Programmable Gata Array (FPGA) to perform sparse optimization...
September 2016: Review of Scientific Instruments
Ji-Hang Zou, Zhen-Qiang Ye, Bing-Yang Cao
Phonon thermal transport in graphene has attracted significant interest in recent years. Phonon thermal properties of graphene are investigated by molecular dynamics simulations using the Tersoff, Tersoff-2010, REBO, and AIREBO potentials. By calculating the phonon properties and thermal conductivity of graphene, the performance of the potentials is evaluated based on comparisons with experimental data. It shows that the Tersoff-2010 and REBO display better dispersion curves for graphene than the original Tersoff and AIREBO...
October 7, 2016: Journal of Chemical Physics
Giorgio Cinacchi, Alberto Maria Pintus, Alessandro Tani
The mechanism of diffusion of helical particles in the new screw-like nematic phase is studied by molecular dynamics numerical simulation. Several dynamical indicators are reported that evidence and microscopically characterise the special translo-rotational motion by which helical particles move in this chiral liquid-crystalline phase. Besides mean square displacements and diffusion coefficients resolved parallel and perpendicular to the nematic director, a suitable translo-rotational van Hove self-correlation function and a sequence of translational and rotational velocity, self- and distinct-, time correlation functions are calculated...
October 7, 2016: Journal of Chemical Physics
S Buathong, M Kelley, F B Dunning
Electron transfer in collisions between low-n, n = 12, Rydberg atoms and targets that attach low-energy electrons can lead to the formation of heavy-Rydberg ion-pair states comprising a weakly-bound positive-negative ion pair that orbit each other at large separations. Measurements of the velocity and angular distribution of ion-pair states produced in collisions with 1,1,1-C2Cl3F3, CBrCl3, BrCN, and Fe(CO)5 are used to show that electron transfer reactions furnish a new technique with which to examine the lifetime and decay energetics of the excited intermediates formed during dissociative electron capture...
October 7, 2016: Journal of Chemical Physics
David Cappelletti, Stefano Falcinelli, Fernando Pirani
Gas phase collisions of a D2 projectile by CF4 and by CCl4 targets have been investigated with the molecular beam technique. The integral cross section, Q, has been measured for both collisional systems in the thermal energy range and oscillations due to the quantum "glory" interference have been resolved in the velocity dependence of Q. The analysis of the measured Q(v) data provided novel information on the anisotropic potential energy surfaces of the studied systems at intermediate and large separation distances...
October 7, 2016: Journal of Chemical Physics
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